Matter
Calcium (Ca) is an element that plays a very important role in many bodily functions.
Draw the Rutherford-Bohr diagram for Calcium.
(see sheet)
If lake A has a pH of 5 and lake B has a pH of 3 how much more acidic is lake B than lake A
100 times
You use your 500W speaker for 45minutes while hanging out with your friends. How much energy in Watt-hours (W-h) did you spend
0.75 x 500 = 375 W-h
What are some ways coastal communities could be impacted by rising sea
levels?
floods, trees are affected by increase in salinity...
other answers are valid too :) (See Param)
Which of the following statements regarding constraints is true?
a) Tearing a sheet of paper is an example of deflection.
b) A game of tug-of-war is an example of torsion.
c) Flattening a cardboard box is an example of compression.
d) Bending a fishing rod is an example of tension!
c) Flattening a cardboard box is an example of compression.
What is the Metalloid with 14 protons?
Silicon (Si)
Balance the following chemical equation
NaOH + H2CO3 --> Na2CO3 + H2O
2 NaOH + H2CO3 --> Na2CO3 + 2 H2O
With regards to the triboelectric series. You rub the wool with the rubber and the polyethylene with the cotton. What will happen when you bring the rubber and the cotton close to each other?
They attract
Which of the following would be the most dense?
a. Water with 3% salinity and 8℃
b. Water with 5% salinity and 6℃
c. Water with 2% salinity and 10℃
b)
Name 2 ways conductivity of a wire can be increased
Increasing the diameter of the wire
Decreasing the temperature of the wire
Decreasing the length of the wire
Changing the type of material (copper is one of the best and most affordable materials)
Draw the ion for fluorine
( see sheet)
The following equation represents an acid-base neutralization reaction.
HCl + NaOH = H2O + NaCl
a) Identify the products and the reactants in this equation.
b) Identify the salt in the products of the equation.
c) Name the two elements which comprise the salt.
a) HCl + NaOH are reactants,
H20 + NaCl are products
b) NaCl which is Sodium Chloride.
c) The two elements that comprise the salt are Sodium and Chlorine
A 20 Volt battery is attached to an electrical circuit that connects to 80 Watt speaker. This circuit also contains a switch and a fuse, all of which are connected in series.
a) Draw a diagram to illustrate the circuit described above.
b) What is the resistance of this circuit (Ω)?
a) see sheet
b) 5 ohms
Which of the following is not a consequence of melting permafrost?
a. Road and infrastructure collapse
b. Decrease in the amount of vegetation in the area
c. Release of methane (CH4)
d. Landslides
See Param
Write the definition of each constraint below. And represent with an image (you can use arrows if you wish)
COMPRESSION
TENSION
TORSION
DEFLECTION
SHEARING
See pg 1 in technological world
Write the number of protons, neutrons and electrons in a Chlorine atom?
p+ = 17
e- = 17
n0 = 18
You mix 20g of Sodium (Na) and a certain amount of Oxygen (O2) to make 55g of Sodium Oxide Na2O. Find the amount of Oxygen used in grams.
25g
The source of energy for a desktop computer is an electrical outlet. The energy from the outlet must be transformed in order for the desktop computer to function properly. List two types of energy transformation that occurs when using a desktop computer. Explain your answer.
luminous: light from the screen
sonic: sound from the speaker
thermal: heat from the laptop
What are some human activities that have caused a rise in greenhouse gas
emissions?
Burning fossil fuels, cutting down forests and farming livestock
other answers accepted. See Param :)
Snowmobiles are designed so that people can drive over snow without slipping or getting stuck in the snow.
a) Name two materials that the tracks of the snowmobile are made with.
b) Identify two mechanical properties that the tracks of the snowmobile must have to withstand the constraints of travelling over snow with passengers. Explain why the manufacturer chose materials with these mechanical properties to construct the tracks.
a) rubber, steel (some metal)
b) rubber --> no slip
metal --> hard, durable
Other answers accepted. See Param.
When the pH of a solution changes from pH 4 to pH 5,
a) OH- ions increases by 10 times
b) OH- ions increases by 100 times
c) H+ ions increases by 10 times
d) H+ ions increases by 100 times
a)
You want to make Koolaid for all your friends. If you want a concentration of 300 ppm and you add 0.6 g of powder, how much water (in mL) do you need to add ?
2000mL
Write the direction of magnetic field and electric current according to the thumb rule:
for Live wires: A. Thumb gives-
B. Fingers give-
for Solenoid: A. Thumb gives-
B. Fingers give-
Live Wires:
A. Electric current
B. Magnetic field
Solenoid
A. Magnetic field
B. Electric current
Name an energy resource in each the atmosphere, lithosphere and hydrosphere and advantages and disadvantages for each.
See table in earth and space crash course pg 13
Consider the gear train below and answer the following questions.
A) Is the wheel and worm gear reversible or non-reversible?
B) Is the wheel and worm gear a motion transmission system, or a motion transformation system?
C) In the space below, provide 1 reason why you think a wheel and worm gear may be used in this fan.
D) When the pin (yellow gear) is pushed down, which way is the green gear spinning? Please circle the correct answer.
See Modified exam 2 answers